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entity.c
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entity.c
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#include <stdlib.h>
#include <string.h>
#include <cJSON.h>
#include "response.h"
#include "database.h"
#include "utils.h"
#include "entity.h"
/* Wild poor man's OOP here */
#define membersize(type, member) sizeof(((type *)0)->member)
const entity_t ENTITIES[3] = {
{"users", 5, {COLUMN_TYPE_STR, COLUMN_TYPE_STR, COLUMN_TYPE_STR,
COLUMN_TYPE_STR, COLUMN_TYPE_INT},
{"email", "first_name", "last_name", "gender", "birth_date"},
{offsetof(user_t, email), offsetof(user_t, first_name),
offsetof(user_t, last_name), offsetof(user_t, gender),
offsetof(user_t, birth_date)},
{membersize(user_t, email), membersize(user_t, first_name),
membersize(user_t, last_name), membersize(user_t, gender),
membersize(user_t, birth_date)},
"{\"id\":%d,\"email\":\"%s\",\"first_name\":\"%s\",\"last_name\":\"%s\","
"\"gender\":\"%s\",\"birth_date\":%d}",
sizeof(user_t)
},
{"visits", 6, {COLUMN_TYPE_INT, COLUMN_TYPE_INT, COLUMN_TYPE_INT,
COLUMN_TYPE_INT, COLUMN_TYPE_NONE},
{"location", "user", "visited_at", "mark", NULL},
{offsetof(visit_t, location), offsetof(visit_t, user),
offsetof(visit_t, visited_at), offsetof(visit_t, mark), -1},
{membersize(visit_t, location), membersize(visit_t, user),
membersize(visit_t, visited_at), membersize(visit_t, mark), -1},
"{\"id\":%d,\"location\":%d,\"user\":%d,\"visited_at\":%d,\"mark\":%d}",
sizeof(visit_t)
},
{"locations", 9, {COLUMN_TYPE_STR, COLUMN_TYPE_STR, COLUMN_TYPE_STR,
COLUMN_TYPE_INT, COLUMN_TYPE_NONE},
{"place", "country", "city", "distance", NULL},
{offsetof(location_t, place), offsetof(location_t, country),
offsetof(location_t, city), offsetof(location_t, distance), -1},
{membersize(location_t, place), membersize(location_t, country),
membersize(location_t, city), membersize(location_t, distance), -1},
"{\"id\":%d,\"place\":\"%s\",\"country\":\"%s\",\"city\":\"%s\","
"\"distance\":%d}",
sizeof(location_t)
}
};
static inline const void* construct_arg(void* ptr, const entity_t* entity, int i)
{
if(UNLIKELY(entity->column_types[i] == COLUMN_TYPE_NONE))
return NULL;
char* arg = (char*)ptr + entity->column_offsets[i];
const void* res = entity->column_types[i] == COLUMN_TYPE_INT ?
(const void*)(intptr_t)(*(int*)arg) : arg;
return res;
}
static int read_entity(database_t* database, int e, int id, char* response)
{
const entity_t* entity = &ENTITIES[e];
GPtrArray* arr = database->entities[e];
if(UNLIKELY((guint)id >= arr->len))
return PROCESS_RESULT_NOT_FOUND;
void* ptr = g_ptr_array_index(arr, id);
if(UNLIKELY(ptr == NULL))
return PROCESS_RESULT_NOT_FOUND;
snprintf(response, RESPONSE_BUFFER_SIZE,
entity->format, id,
construct_arg(ptr, entity, 0),
construct_arg(ptr, entity, 1),
construct_arg(ptr, entity, 2),
construct_arg(ptr, entity, 3),
construct_arg(ptr, entity, 4));
return 0;
}
static int update_entity(database_t* database, cJSON* json, int e, int id)
{
const entity_t* entity = &ENTITIES[e];
GPtrArray* arr = database->entities[e];
/* first, check the entity even exists */
if(UNLIKELY((guint)id >= arr->len))
return PROCESS_RESULT_NOT_FOUND;
void* ptr = g_ptr_array_index(arr, id);
if(UNLIKELY(ptr == NULL))
return PROCESS_RESULT_NOT_FOUND;
/* validate body first */
cJSON* args[5];
int none_set = 1;
for(int i = 0; i < 5; i++)
{
if(UNLIKELY(entity->column_types[i] == COLUMN_TYPE_NONE))
break;
if(!(args[i] = cJSON_GetObjectItemCaseSensitive(
json, entity->column_names[i])))
continue;
none_set = 0;
if(UNLIKELY(cJSON_IsNull(args[i])))
return PROCESS_RESULT_BAD_REQUEST;
}
if(none_set)
return PROCESS_RESULT_BAD_REQUEST;
/* temporarily remove from indexes */
if(e == 1 && args[0])
update_visits_location_index(database, ptr, 0);
if(e == 1 && (args[1] || args[2]))
update_visits_user_index(database, ptr, 0);
/* now set the fields */
for(int i = 0; i < 5; i++)
{
if(UNLIKELY(entity->column_types[i] == COLUMN_TYPE_NONE))
break;
if(!args[i])
continue;
if(entity->column_types[i] == COLUMN_TYPE_INT)
*(int*)((char*)ptr + entity->column_offsets[i]) = args[i]->valueint;
else
strncpy((char*)ptr + entity->column_offsets[i],
args[i]->valuestring, entity->column_sizes[i]);
}
/* update indexes */
if(e == 1 && args[0])
update_visits_location_index(database, ptr, 1);
if(e == 1 && (args[1] || args[2]))
update_visits_user_index(database, ptr, 1);
return PROCESS_RESULT_OK;
}
static int create_entity(database_t* database, cJSON* json, int e)
{
cJSON* json_id = cJSON_GetObjectItemCaseSensitive(json, "id");
if(UNLIKELY(!json_id || !cJSON_IsNumber(json_id)))
{
return PROCESS_RESULT_BAD_REQUEST;
}
int id = json_id->valueint;
GPtrArray* arr = database->entities[e];
/* first, check the entity already exists */
void* ptr = NULL;
if(UNLIKELY((guint)id < arr->len))
ptr = g_ptr_array_index(arr, id);
if(UNLIKELY(ptr != NULL))
return PROCESS_RESULT_BAD_REQUEST;
return insert_entity(database, json, e);
}
int process_entity(database_t* database,
int entity, int id, int write,
const char* body, char* response)
{
if(write)
{
cJSON* root = cJSON_Parse(body);
if(UNLIKELY(!root))
{
strcpy(response, "failed to parse JSON");
return PROCESS_RESULT_BAD_REQUEST;
}
int rc;
if(id == -1) // new
rc = create_entity(database, root, entity);
else
rc = update_entity(database, root, entity, id);
cJSON_Delete(root);
strcpy(response, "{}");
return rc;
}
return read_entity(database, entity, id, response) == 0 ?
PROCESS_RESULT_OK :
PROCESS_RESULT_NOT_FOUND;
}